Flexible semiaromatic polyamides with a low moisture uptake

Abstract

The present invention relates to a flexible semiaromatic polyamide composition with a low moisture uptake, made up by weight, the total being 100: A) 60 to 99.5% (preferably 70 to 93%) of at least one copolyamide of formula X/Y,Ar in which there are between 0.5 and 0.7 mol of X per 1 mol of Y, and in which Y denotes the residues of 1,10-decanediamine, Ar denotes the residues of terephthalic acid, X denotes the residue of aminoundecanoic acid NH 2 —(CH 2 ) 10 —COOH, the unit Y,I residue from the condensation of the diamine (Y) with isophthalic acid, wherein said composition is a flexible semiaromatic copolyamide; B) 0.5 to 40% (preferably 7 to 30%) of at least one product chosen from plasticizers, nanofillers, polyolefins, crosslinked polyolefins and additives.

1. Composition comprising, by weight, the total being 100:
 −60 to 99.5% of at least one copolyamide of formula X/Y,Ar in which there is between 0.5 and 0.7 mol of X per 1 mol of Y, and in which:
 Y denotes the residues of 1,10-decanediamine, 
 Ar denotes the residues of terephthalic acid, 
 X denotes the residue of aminoundecanoic acid NH 2 —(CH 2 ) 10 —COOH, the unit Y,I residue from the condensation of the diamine (Y) with isophthalic acid, wherein said composition is a flexible semiaromatic copolyamide; 
 
 −0.5 to 40% of at least one product chosen from nanofillers, polyolefins, crosslinked polyolefins and additives selected from the group consisting of dyes, pigments, brighteners, antioxidants, flame retardants, UV stabilizers, and nucleating agents. 
 
     
     
       2. Composition according to  claim 1 , in which the proportion of the copolyamide is from 70 to 93% for 7 to 30% of at least one product chosen from nanofillers, polyolefins, crosslinked polyolefins and additives selected from the group consisting of dyes, pigments, brighteners, antioxidants, flame retardants, UV stabilizers, and nucleating agents. 
     
     
       3. Composition according to  claim 1 , in which the intrinsic viscosity of the copolyamide is between 0.5 and 2. 
     
     
       4. Composition according to  claim 3 , in which the intrinsic viscosity of the copolyamide is between 0.8 and 1.8. 
     
     
       5. Composition according to  claim 1 , in which Y and Ar are in stoichiometric proportions or proportions very close to stoichiometric. 
     
     
       6. Composition according to  claim 1  in which X/Y,Ar denotes 11/10,T, which results from the condensation of aminoundecanoic acid, 1,10-decanediamine and terephthalic acid. 
     
     
       7. Structure comprising a layer composed of the composition according to  claim 1 . 
     
     
       8. Formulation comprising magnetic fillers and binder, wherein said binder comprises of the composition according to  claim 1 .